Thermalright XP-90C Heatsink
 

Three or four degrees difference over the Zalman cooler may not seem like
much, but to an enthusiast that may mean the difference in a decent
overclock and a great overclock. Naturally when compared to the stock
cooler on the 3.4 there is no surprise in the huge temperature difference,
but it does give a great example of how much more efficient the XP-90 is.

http://www.viperlair.com/reviews/coo...alright/xp90c/

How does a 5100rpm 90mm fan sound?

70+ dBA at 40cm distance.. at least

which is too say "frikking loud"